Heavy Equipment Operator Certification Exam Prep · Question
A gravel pit requires compacting a granular base layer. The specification calls for 98% Modified Proctor density. The lab test shows the maximum dry density for this material is 2100 kg/m³ with an optimum moisture content of 8%. What is the target wet density in the field at maximum compaction?
Target dry density at 98% Modified Proctor is 2100 kg/m³ * 0.98 = 2058 kg/m³. Then, the target wet density at 8% moisture is 2058 kg/m³ * (1 + 0.08) = 2058 kg/m
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Question: A gravel pit requires compacting a granular base layer. The specification calls for 98% Modified Proctor density. The lab test shows the maximum dry density for this material is 2100 kg/m³ with an optimum moisture content of 8%. What is the target wet density in the field at maximum compaction?
Answer options:
- 2100 kg/m³
- 2058 kg/m³
- 2268 kg/m³ ✅ 2226.24 kg/m³
Correct answer: 2226.24 kg/m³
Explanation: Target dry density at 98% Modified Proctor is 2100 kg/m³ * 0.98 = 2058 kg/m³. Then, the target wet density at 8% moisture is 2058 kg/m³ * (1 + 0.08) = 2058 kg/m³ * 1.08 = 2226.24 kg/m³. (Reference: Ontario Reg 213/91, General requirements for construction projects, and CSA A23.1-F16).
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